EP 3421459 A4 20190925 - METHOD FOR SYNTHESIZING LACTIDE BY MEANS OF CATALYSIS OF LACTIC ACID
Title (en)
METHOD FOR SYNTHESIZING LACTIDE BY MEANS OF CATALYSIS OF LACTIC ACID
Title (de)
VERFAHREN ZUR HERSTELLUNG VON LACTID MITTELS KATALYSE VON MILCHSÄURE
Title (fr)
PROCÉDÉ DE SYNTHÈSE DE LACTIDE PAR CATALYSE D'ACIDE LACTIQUE
Publication
Application
Priority
- CN 201610102406 A 20160224
- CN 2016075167 W 20160301
Abstract (en)
[origin: EP3421459A1] The present invention relates to a method for the catalytic synthesis of lactide from lactic acid. The method relates to the synthesis of lactide from lactic acid under the catalysis of a zinc oxide nanoparticle aqueous dispersion as a catalyst. The present invention has four technical characteristics: I. the zinc oxide nanoparticle aqueous dispersion catalyst has a sufficient surface area, and the size of nanoparticles is merely 30-40 nm, providing a sufficient contact area between the substrate (lactic acid) and the catalyst; II. the new catalyst has a milder catalytic effect on polymerization, allowing the molecular weight distribution of a prepolymer within a range of 400-1500 g/mol, which is advantageous for depolymerization to proceed; III. the new catalyst is stable, thus avoiding oxidation or carbonization in a high temperature reaction; and IV. the new catalyst has a low toxicity and a small threat to human health.
IPC 8 full level
C07D 319/12 (2006.01); B01J 23/06 (2006.01); B01J 35/10 (2006.01)
CPC (source: CN EP US)
B01J 23/06 (2013.01 - EP US); B01J 35/23 (2024.01 - US); C07D 319/12 (2013.01 - CN EP US); B01J 35/60 (2024.01 - EP US)
Citation (search report)
- [Y] CHAO CHENG: "The Selection of Catalyst to Prepare Lactide and an Initial Analysis of Reaction Mechanism", SCIENCE -ENGINEERING (A), CHINA MASTER'S THESES FULL-TEXT DATABASE, 31 January 2006 (2006-01-31), pages 1 - 8, XP055571152
- [Y] CHEN JIA ET AL: "Advances of Catalysts for Synthesizing Lactide", HUAXUE YANJIU YU YINGYONG - CHEMICAL RESEARCH AND APPLICATION, GAI-KAN BIAN-WEI-HUI, CHENGDU, CN, vol. 19, no. 4, 30 April 2007 (2007-04-30), pages 358 - 360, XP009511551, ISSN: 1004-1656
- See references of WO 2017143622A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3421459 A1 20190102; EP 3421459 A4 20190925; EP 3421459 B1 20201223; CN 107118200 A 20170901; CN 107118200 B 20200228; US 10392362 B2 20190827; US 2019047976 A1 20190214; WO 2017143622 A1 20170831
DOCDB simple family (application)
EP 16891076 A 20160301; CN 2016075167 W 20160301; CN 201610102406 A 20160224; US 201616078674 A 20160301